[Qtfm-announce] QTFM version 3.4

[Release a. a. u. <qtf...@li...>]

A new release of the Quaternion Toolbox for Matlab (QTFM) has been 
posted on Sourceforge.

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                 Quaternion toolbox for Matlab
http://qtfm.sourceforge.net/
        Mailing list: qtf...@li...
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Copyright © 2005-2023 Stephen J. Sangwine & Nicolas Le Bihan
Email: san...@us...
nic...@gi...
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                      Release Notes

Version 3.5 10 October 2023

The quaternion BLKDIAG function has been removed from the toolbox, as the
MATLAB function of the same name now works for quaternions (and octonions),
hence there is no need for an overloaded quaternion function. (This does
assume a recent version of MATLAB - unfortunately we don't know in which
version of MATLAB the BLKDIAG function started working for quaternions.)

The MATLAB POLY function has been overloaded for Hermitian quaternion
matrices. The new function computes the characteristic polynomial of a
given matrix, the roots of which are the eigenvalues of the matrix as
already computed by EIG. For non-Hermitian matrices the existing ADJOINT
function and the MATLAB POLY function will compute a characteristic
polynomial of order one greater.

The quaternion MPOWER function now handles arbitrary integer powers using
an efficient repeated squaring algorithm.

The SVD function now supports the outputForm parameter as per the Matlab
SVD function.

The Matlab PINV function no longer works with quaternion matrices from
Matlab release R2023b, because of the use of Matlab built-in undocumented
functions which cannot handle quaternions. A new QTFM function PINV has
been implemented to overload the Matlab function.